package com.juvenxu.mvnbook.account.persist;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentFactory;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

public class AccountPersistServiceImpl implements AccountPersistService {

	private static final String ELEMENT_ROOT = "account-persist";

	private static final String ELEMENT_ACCOUNTS = "accounts";

	private static final String ELEMENT_ACCOUNT_ID = "id";

	private static final String ELEMENT_ACCOUNT_NAME = "name";

	private static final String ELEMENT_ACCOUNT_EMAIL = "email";

	private static final String ELEMENT_PASSWORD = "password";

	private static final String ELEMENT_ACCOUNT_ACTIVATED = "activated";

	private String file;

	private SAXReader reader = new SAXReader();

	private Document readDocument() throws AccountPersistException {
		File dataFile = new File(file);
		if (!dataFile.exists()) {
			dataFile.getParentFile().mkdirs();
			Document doc = DocumentFactory.getInstance().createDocument();
			Element rootEle = doc.addElement(ELEMENT_ROOT);
			rootEle.addElement(ELEMENT_ACCOUNTS);
			writeDocument(doc);
		}

		try {
			return reader.read(new File(file));
		} catch (DocumentException e) {
			throw new AccountPersistException("Unable to read persist data xml", e);
		}
	}

	private void writeDocument(Document doc) throws AccountPersistException {
		Writer out = null;
		try {
			out = new OutputStreamWriter(new FileOutputStream(file), "UTF-8");
			XMLWriter writer = new XMLWriter(out, OutputFormat.createPrettyPrint());
			writer.write(doc);
		} catch (IOException e) {
			throw new AccountPersistException("Unable to write persist data xml.", e);
		}finally {
			try {
				if(out!=null){
					out.close();
				}
			} catch (IOException e) {
				throw new AccountPersistException("Unable to close persist data xml writer.", e);
			}
		}
	}

	@Override
	public Account createAccount(Account account) throws AccountPersistException {
		return null;
	}

	@Override
	public Account readAccount(String id) throws AccountPersistException {
		
		
		Document doc=readDocument();
		Element accountsEle=doc.getRootElement().element(ELEMENT_ACCOUNTS);
		
		for (Element accountEle : (List<Element>)accountsEle.elements()) {
			if(accountEle.elementText(ELEMENT_ACCOUNT_ID).equals(id)){
				return buildAccount(accountEle);
			}
		}
		return null;
	}

	private Account buildAccount(Element element) {
		Account account=new Account();
		
		account.setId(element.elementText(ELEMENT_ACCOUNT_ID));
		account.setName(element.elementText(ELEMENT_ACCOUNT_NAME));
		account.setEmail(element.elementText(ELEMENT_ACCOUNT_EMAIL));
		account.setPassword(element.elementText(ELEMENT_PASSWORD));
		account.setActivated(Boolean.valueOf(element.elementText(ELEMENT_ACCOUNT_ACTIVATED)));
		return account;
	}

	@Override
	public Account updateAccount(Account account) throws AccountPersistException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public void deleteAccount(String id) throws AccountPersistException {
		// TODO Auto-generated method stub

	}

}
